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We were investigating lignin degradation by the bacterium Lignumus decaderum in the lab which was isolated from rotting piece oak. The genomic sequence of this bacterium has not yet been determined. The addition of a small quantity of hydrogen peroxide induces production of an enzyme that enables the organism to degrade lignin. Zymography has revealed that a single form of the enzyme is present in cultures grown under solid-state fermentation conditions. The enzyme was puried and was found to catalyzes C-C bond cleavage in the side chains of lignin but is unable to do so without added H2O2. When the enzyme preparation is added to pure cellulose under similar reaction conditions, hydrogen peroxide is consumed but to a lesser degree than when lignin is used as substrate. Interestingly, you find that bubbling pure oxygen into the cultures does not result in any enzyme activity against either lignin or cellulose.
What type of enzyme have you discovered? And what is the rationelle for it?
How important is nutrition at this stage in preventing future disease and How might nutrition affect growth, development, and learning at this stage?
Which of the following should NOT be expected to cause a change in the frequencies of alleles in a population?
It is determined that the human immune system synthesizes 10 8 – 10 10 antibodies. The portion of a typical active in binding antigen consists of two variable domains each containing one hundred amino acids.
Discuss the difference between a totipotent cell and a differentiated cell, genetically and morphologically?
Develop a labeled diagram of a small section of the plasma membrane and briefly describe its structure and function.
Determining genotypes in autosomal dominant pedigrees. From the list on the left hand of the picture are the choices for the blanks with arrrows.
Once there, watch the videos listed. These videos introduce you to some of the major challenges facing scientists and doctors as they try to combat emerging, highly infectious, and resistant microbes.
A signalling pathway in the cell is turned on by phosphorylation, leading to decreases in cell division. What is the effect of a mutation that results in the overexpression of an oncogene coding for a phosphatase that works on this pathway?
Assume you are a clinician in a small hospital and are monitoring the progression of myclonic epilepsy in twin boys. One twin remains only mildly affected by the condition.
Consider a culture into which two E. coli strains are inoculated. Strain A is normal with g=21 min at 37 degrees C, and 42 mins at 27 degrees C. Strain B has a temperature-sensitive mutation, such that g=55 mins at 37 degrees C, and 39 mins at 27 ..
About 13 different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago.
Which of these is not a characteristic of carbon.
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